2CaO・SiO_2 粒子の浮上分離現象を利用した転炉スラグの脱燐法

概要

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Mineralogical study of LD converter slag was carried out by means of microscopic and EPMA examinations and phosphorus was found to exist only in dicalcium silicate as solid solution. This led to the study of separation of dicalcium silicate from LD converter slag in order to remove phosphorus. When liquid slag was solidified slowly, most dicalcium silicate particles accumulated in the top part of the melt and fewer in the bottom. The phenomena can be interpreted as follows : on solidification, dicalcium silicate is crystallized primarily and floats up owing to the difference of density between dicalcium silicate and residual liquid. Using this phenomena enabled us to separate LD converter slag into two layers, top and bottom in a vessel. As a result of slow cooling, CaO, SiO_2 and P_2O_5 were enriched in the top, and FeO, Fe_2O_3 and MnO, were in the bottom. Dicalcium silicate was found to be apt to separate more efficiently with higher total iron content in slag, and at higher start temperature of cooling, close to liquidus temperature. The efficiency of separation was improved by blowing oxygen into the molten slag before cooling.
社団法人日本鉄鋼協会の論文
1980-08-01